Buggy code:
public class SelectionParser extends AssistParser { public int selectionStart ; public int selectionEnd ; public static final char [ ] SUPER = "super" . toCharArray ( ) ; public static final char [ ] THIS = "this" . toCharArray ( ) ; public SelectionParser ( ProblemReporter problemReporter , boolean assertMode ) { } public char [ ] assistIdentifier ( ) { } protected void attachOrphanCompletionNode ( ) { } private boolean checkRecoveredType ( ) { } protected void classInstanceCreation ( boolean alwaysQualified ) { } protected void consumeArrayCreationExpression ( ) { } protected void consumeEnterAnonymousClassBody ( ) { } protected void consumeEnterVariable ( ) { } protected void consumeExitVariableWithInitialization ( ) { } protected void consumeFieldAccess ( boolean isSuperAccess ) { } protected void consumeFormalParameter ( ) { } protected void consumeInstanceOfExpression ( int op ) { } protected void consumeMethodInvocationName ( ) { } protected void consumeMethodInvocationPrimary ( ) { } protected void consumeTypeImportOnDemandDeclarationName ( ) { } public ImportReference createAssistImportReference ( char [ ] [ ] tokens , long [ ] positions ) { } public ImportReference createAssistPackageReference ( char [ ] [ ] tokens , long [ ] positions ) { } protected LocalDeclaration createLocalDeclaration ( Expression initialization , char [ ] name , int sourceStart , int sourceEnd ) { } public NameReference createQualifiedAssistNameReference ( char [ ] [ ] previousIdentifiers , char [ ] name , long [ ] positions ) { } public TypeReference createQualifiedAssistTypeReference ( char [ ] [ ] previousIdentifiers , char [ ] name , long [ ] positions ) { } public NameReference createSingleAssistNameReference ( char [ ] name , long position ) { } public TypeReference createSingleAssistTypeReference ( char [ ] name , long position ) { } public CompilationUnitDeclaration dietParse ( ICompilationUnit sourceUnit , CompilationResult compilationResult , int selectionStart , int selectionEnd ) { } protected NameReference getUnspecifiedReference ( ) { int completionIndex ; if ( ( completionIndex = indexOfAssistIdentifier ( ) ) < 0 ) { return super . getUnspecifiedReference ( ) ; } int length = identifierLengthStack [ identifierLengthPtr ] ; if ( CharOperation . equals ( assistIdentifier ( ) , SelectionParser . SUPER ) ) { Reference reference ; if ( completionIndex > 0 ) { identifierLengthStack [ identifierLengthPtr ] = completionIndex ; int ptr = identifierPtr -= length - completionIndex ; reference = new SelectionOnQualifiedSuperReference ( getTypeReference ( 0 ) , ( ( int ) ( ( identifierPositionStack [ ( ptr + 1 ) ] ) > > > 32 ) ) , ( ( int ) ( identifierPositionStack [ ( ptr + 1 ) ] ) ) ) ; } else { identifierPtr -= length ; ( identifierLengthPtr ) -- ; reference = new SelectionOnSuperReference ( ( ( int ) ( ( identifierPositionStack [ ( ( identifierPtr ) + 1 ) ] ) > > > 32 ) ) , ( ( int ) ( identifierPositionStack [ ( ( identifierPtr ) + 1 ) ] ) ) ) ; } pushOnAstStack ( reference ) ; this . assistNode = reference ; this . lastCheckPoint = ( reference . sourceEnd ) + 1 ; if ( ( ! ( diet ) ) || ( ( dietInt ) != 0 ) ) { this . restartRecovery = true ; this . lastIgnoredToken = - 1 ; } this . isOrphanCompletionNode = true ; <START_BUG> return new SingleNameReference ( new char [ 0 ] , 0 ) ; <END_BUG> } NameReference nameReference ; char [ ] [ ] subset = identifierSubSet ( completionIndex ) ; ( identifierLengthPtr ) -- ; identifierPtr -= length ; long [ ] positions = new long [ length ] ; System . arraycopy ( identifierPositionStack , ( ( identifierPtr ) + 1 ) , positions , 0 , length ) ; if ( completionIndex == 0 ) { nameReference = this . createSingleAssistNameReference ( assistIdentifier ( ) , positions [ 0 ] ) ; } else { nameReference = this . createQualifiedAssistNameReference ( subset , assistIdentifier ( ) , positions ) ; } assistNode = nameReference ; this . lastCheckPoint = ( nameReference . sourceEnd ) + 1 ; if ( ! ( diet ) ) { this . restartRecovery = true ; this . lastIgnoredToken = - 1 ; } this . isOrphanCompletionNode = true ; return nameReference ; } protected NameReference getUnspecifiedReferenceOptimized ( ) { } public void initializeScanner ( ) { } protected MessageSend newMessageSend ( ) { } public CompilationUnitDeclaration parse ( ICompilationUnit sourceUnit , CompilationResult compilationResult , int selectionStart , int selectionEnd ) { } protected boolean resumeAfterRecovery ( ) { } public void selectionIdentifierCheck ( ) { } public void setAssistIdentifier ( char [ ] assistIdent ) { } protected void updateRecoveryState ( ) { } }

Fix:
return new SingleNameReference ( CharOperation . NO_CHAR , 0 ) ;